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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Beyond-laboratory-scale prediction for channeling flows through subsurface rock fractures with heterogeneous aperture distributions revealed by laboratory evaluation
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Beyond-laboratory-scale prediction for channeling flows through subsurface rock fractures with heterogeneous aperture distributions revealed by laboratory evaluation

机译：实验室评估揭示了超越实验室规模的，通过非均质孔径分布的地下岩石裂缝窜流的预测

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The present study evaluates aperture distributions and fluid flow characteristics for variously sized laboratory-scale granite fractures under confining stress. As a significant result of the laboratory investigation, the contact area in fracture plane was found to be virtually independent of scale. By combining this characteristic with the self-affine fractal nature of fracture surfaces, a novel method for predicting fracture aperture distributions beyond laboratory scale is developed. Validity of this method is revealed through reproduction of the results of laboratory investigation and the maximum aperture-fracture length relations, which are reported in the literature, for natural fractures. The present study finally predicts conceivable scale dependencies of fluid flows through joints (fractures without shear displacement) and faults (fractures with shear displacement). Both joint and fault aperture distributions are characterized by a scale-independent contact area, a scale-dependent geometric mean, and a scale-independent geometric standard deviation of aperture. The contact areas for joints and faults are approximately 60% and 40%. Changes in the geometric means of joint and fault apertures (mu m), e(m,joint) and e(m,fault), with fracture length (m), l, are approximated by e(m,joint)=1x10(2)l(0.1) and e(m,fault)=1x10(3)l(0.7), whereas the geometric standard deviations of both joint and fault apertures are approximately 3. Fluid flows through both joints and faults are characterized by formations of preferential flow paths (i.e., channeling flows) with scale-independent flow areas of approximately 10%, whereas the joint and fault permeabilities (m(2)), k(joint) and k(fault), are scale dependent and are approximated as k(joint)=1x10(-12)l(0.2) and k(fault)=1x10(-8)l(1.1).
机译：本研究评估了在有限应力下各种尺寸的实验室规模的花岗岩裂缝的孔径分布和流体流动特征。作为实验室研究的重要结果，发现断裂面的接触面积实际上与规模无关。通过将这一特征与断裂表面的自仿射分形性质相结合，开发了一种预测超出实验室规模的裂缝孔径分布的新方法。通过对自然裂缝的实验室研究结果和最大孔径-裂缝长度关系的再现，揭示了该方法的有效性。本研究最终预测了可以想象的流体通过节理（无剪切位移的裂缝）和断层（有剪切位移的裂缝）流动的尺度相关性。关节孔和断层孔的分布都以与尺度无关的接触面积，与尺度无关的几何平均值和与孔径无关的几何标准偏差为特征。关节和断层的接触面积约为60％和40％。接缝和断层孔径（μm），e（m，joint）和e（m，fault）的几何平均值随裂缝长度（m），l的变化近似为e（m，joint）= 1x10（ 2）l（0.1）和e（m，fault）= 1x10（3）l（0.7），而节流孔和断层孔的几何标准偏差都约为3。优先流动路径（即通道流动），与尺度无关的流动面积约为10％，而节理和断层渗透率（m（2）），k（节理）和k（断层）则与尺度有关，近似为k（关节）= 1x10（-12）l（0.2）和k（故障）= 1x10（-8）l（1.1）。

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